// Copyright (C) 2018 Valerie Young. All rights reserved.
// This code is governed by the BSD license found in the LICENSE file.

/*---
esid: sec-asyncgenerator-prototype-next
description: next() requests from iterator processed in order, await
info: >
  AsyncGenerator.prototype.next ( value )
  1. Let generator be the this value.
  2. Let completion be NormalCompletion(value).
  3. Return ! AsyncGeneratorEnqueue(generator, completion).

  AsyncGeneratorEnqueue ( generator, completion )
  ...
  4. Let queue be generator.[[AsyncGeneratorQueue]].
  5. Let request be AsyncGeneratorRequest{[[Completion]]: completion,
     [[Capability]]: promiseCapability}.
  6. Append request to the end of queue.
  ...

  AsyncGeneratorResolve ( generator, value, done )
  ...
  2. Let queue be generator.[[AsyncGeneratorQueue]].
  3. Assert: queue is not an empty List.
  4. Remove the first element from queue and let next be the value of that element.
  ...

flags: [async]
features: [async-iteration]
---*/

function Test() {
    var yieldorder = 0;
    var resolveLatePromise;

    function resolveLater() {
      return new Promise(resolve => {
        resolveLatePromise = resolve;
      });
    }

    async function* g() {
      yield resolveLater();
      yield ++yieldorder;
    }

    var iter = g();

    assert.sameValue(yieldorder, 0);

    var item1 = iter.next();
    var item2 = iter.next();
    var item3 = iter.next();

    async function awaitnexts() {
      assert.sameValue((await item3).value, undefined)
      assert.sameValue(yieldorder, 2, "All next requests have been proccessed.")
      assert.sameValue((await item2).value, 2)
      assert.sameValue((await item1).value, 1)
    }

    awaitnexts().then($DONE, $DONE);

// At this point:
//   yieldorder == 0
//   item1 is an unresolved promise
    resolveLatePromise(++yieldorder);
}

// preheat
const NUMBER_OF_PREHEAT = 1;
for (let i = 0; i < NUMBER_OF_PREHEAT; i++) {
    Test();
}

ArkTools.jitCompileAsync(Test);
assert.sameValue(ArkTools.waitJitCompileFinish(Test), true, '[JIT] JIT disabled.');

// test
const NUMBER_OF_TEST = 1; // or 2
for (let i = 0; i < NUMBER_OF_PREHEAT; i++) {
    Test();
}
